I would like to see the ability to link accounts (rather than simply subaccounts). We have several different corporate entities, which forces us to create seperate accounts for all our sites.

The other thing I really HATE about using ccbill is its slowness. Checking stats, looking up transactions, etc is one of the most time consuming and boring duties I have... and mostly because of how incredibly slow the servers are (and I check my stats in the middle of the night!)